OREGON STATE UNIVERSITY

Glossary beginning with V

Volcano Term Definitions

v
Vent

The opening at the earth's surface through which volcanic materials issue forth.

Vesicle

A small air pocket or cavity formed in volcanic rock during solidification

Viscosity

A measure of resistance to flow in a liquid (water has low viscosity while honey has a higher viscosity.)

Volcanic Complex

A persistent volcanic vent area that has built a complex combination of volcanic landforms.

Vulcanian

A type of eruption consisting of the explosive ejection of incandescent fragments of new viscous lava, usually on the form of blocks.